Ink jet recording paper incorporating novel precipitated calcium carbonate pigment

Abstract

An improved thermal ink jet recording paper, incorporating heat aged precipitated calcium carbonate ("PCC") and a binder, is disclosed. Heat aging the PCC in the presence of an organophosphonate produces discrete particles of PCC with a surface morphology and chemistry that enhances the ability of the PCC to bind to ink jet ink without binding so strongly that the color of the ink is changed. Ink jet recording papers incorporating the PCC and binders of the present invention have reduced feathering, spreading, and penetration or backside showthrough, as well as improved optical density, dry time, and water fastness.

I claim: 
     
       1. An inkjet recording paper comprising a paper base stock, having thereon a coating comprising a heat aged precipitated calcium carbonate pigment, and a binder, said pigment produced by heat aging a slurry of precipitated calcium carbonate particles in the presence of an effective amount of an organophosphonate compound to control the extent or degree of heat aging. 
     
     
       2. The ink jet paper of claim 1, wherein the heat aged precipitated calcium carbonate pigment has a BET specific surface area of at least about 60 m 2  /g. 
     
     
       3. The ink jet recording paper of claim 1, wherein the binder is polyvinyl alcohol or a starch.